问题
I am trying to create a udf to take two strings as parameters; one in DD-MM-YYYY format (e.g. "14-10-2019") and the other in float format (e.g. "0.000"). I want to convert the float-like string to an int and add it to the date object to get another date which I want to return as a string.
def getEndDate = udf{ (startDate: String, no_of_days : String) =>
val num_days = no_of_days.trim.toInt //Converts the String value to Integer
val date = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss").parse(startDate) //Parses the string date to timestamp
calObj.setTime(date) //Sets the calendar object instance
calObj.add(Calendar.DAY_OF_MONTH, num_days) //Adds the number of days to the start date
val endDate = calObj.getTime().toString //Gets end date in string format
endDate
}
When trying to run this, I am getting the following error:
Caused by: java.lang.NumberFormatException: For input string: "0.000"
回答1:
Strings like "0.0000" can't be parsed directly to integer. What you could try instead is to use first toDouble and then toInt:
no_of_days.trim.toDouble.toInt
It will round value down. If you want to round value to closest maybe you should consider using round:
no_of_days.trim.toDouble.round
Another issue with your code is, that you shouldn't use SimpleDateFormat since it's outdated. You should use LocalDate and DateTimeFormatter instead:
val date = LocalDate.parse(startDate, DateTimeFormatter.ofPattern("dd-MM-
yyyy"))
date.plusDays(num_days)
回答2:
I wouldn't recommend doing this but here's some examples which solve your problem.
scala> "0.00".toDouble.toInt
res0: Int = 0
scala> "2.45".toDouble.toInt
res1: Int = 2
scala> "2.5".toDouble.toInt
res2: Int = 2
scala> "2.6".toDouble.toInt
res3: Int = 2
scala> "-1".toDouble.toInt
res4: Int = -1
scala> "-1.5".toDouble.toInt
res5: Int = -1
来源：https://stackoverflow.com/questions/58871114/java-lang-numberformatexception-for-input-string-0-000